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Mineralogical characteristics and photocatalytic properties of natural sphalerite from China

Journal of Environmental Sciences 2020年第3期32卷 156-166页

作者： Can Shen Xiangping gu Bin Yang Dexian Zhang Zhilin Wang Zhengxiang Shu Jeffrey Dick Anhuai Lu Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education Central South UniversityChangsha 410083China School of Geoscience and Info-physics Central South UniversityChangsha 410083China

Different natural sphalerites have a range of photocatalytic properties that can potentially be exploited for environmental remediation *** develop value in the exploitation of sphalerite,samples were collected from 19 ore deposits in China and characterized for their mineralogical and photocatalytic properties.X-ray diffraction(XRD) and electron probe micro analysis(EPMA) measurements indicated that all the natural sphalerites from various localities crystallized in cubic phases with various chemical *** substitution of Fe for Zn ranged from 0.235% to 14.826% by weight,Mn from 0.004% to4.868%,Cu from 0.009% to 5.529% and Cd from 0.133% to 1.576%.As Fe became more abundant,the color of natural sphalerite darkened,becoming almost black;and higher Fe content was associated with stronger visible light *** spectra showed emission mainly related to S-vacancies and progressively decreasing fluorescence intensity with increasing Fe *** of the photocatalytic degradation of methyl orange indicated that the sample with the highest Cd content but moderate Fe content had the highest photocatalytic ***,the degradation of Methyl Orange(30 mg/L)attained 82.11% efficiency under visible light irradiation for 4 hr of natural sphalerite with4.262% Fe and 1.576% ***,the Fe content in sphalerite was found to contribute to the visible light absorption ability and the recombination rate of photo-generated electrons and holes,while substitution by Cd was observed to have a greater effect on the photocatalytic *** findings provide a scientific basis for the profitable utilization of base metal resources like sphalerite.

关键词： Natural sphalerite Mineralogical properties Band gap Photodegradation of Methyl Orange

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Hydrogen production via chemical looping reforming of coke oven gas

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Green Energy & Environment 2021年第5期6卷 678-692页

作者： Kun Yang Zhenhua gu Yanhui Long Shen Lin Chunqiang Lu Xing Zhu Hua Wang Kongzhai Li State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming650093China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093China

Coke oven gas(COG)is one of the most important by-products in steel industry,and the conversion of COG to value-added products has attracted much attention from both economic and environmental *** this work,we use the chemical looping reforming technology to produce pure H_(2) from COG.A series of La1-xSrxFeO_(3)(x?0,0.2,0.3,0.4,0.5,0.6)perovskite oxides were prepared as oxygen carriers for this *** reduction behaviors of La1-xSrxFeO_(3) perovskite by different reducing gases(H_(2),CO,CH4 and the mixed gases)are investigated to discuss the competition effect of different components in COG for reacting with the oxygen *** results show that reduction temperatures of H_(2) and CO are much lower than that of CH4,and high temperatures(>800℃)are requested for selective oxidation of methane to *** co-existence of CO and H_(2) shows weak effect on the equilibrium of methane conversion at high temperatures,but the oxidation of methane to syngas can inhibit the consumption of CO and H_(2).The doping of suitable amounts of Sr in LaFeO_(3) perovskite(e.g.,La0.5Sr0.5FeO_(3))significantly promotes the activity for selective oxidation of methane to syngas and inhibits the formation of carbon deposition,obtaining both high methane conversion in the COG oxidation step and high hydrogen yield in the water splitting *** La0.5Sr0.5FeO_(3) shows the highest methane conversion(67.82%),hydrogen yield(3.34 mmol g^(-1))and hydrogen purity(99.85%).The hydrogen yield in water splitting step is treble as high as the hydrogen consumption in reduction *** results reveal that chemical looping reforming of COG to produce pure H_(2) is feasible,and an O_(2)-assistant chemical looping reforming process can further improves the redox stability of oxygen carrier.

关键词： Coke oven gas Chemical looping reforming La1-xSrxFeO_(3) Oxygen carrier Hydrogen yield

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Pedogenic carbonate isotope record of vegetational evolution since late Miocene in Loess Plateau

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Chinese Science Bulletin 1999年第11期44卷 1034-1038页

作者： Shiling Yang Zhongli Ding Zhaoyan gu Jimin Sun Shangfa Xiong Chinese Acad Sci Inst Geol Beijing 100029 Peoples R China

lsotopic analyses for paleovegetational evolution have been carried out on samples of the pedogenic carbonate nodules in the Red Clay-Loess sequence at Lingtai （35°N）, the Loess Plateau. Stable carbon isotopic composition indicates that （ ⅰ ） C4 plants might be present at least by7.0 Ma; （ ⅱ ） C4 plants expanded gradually between ～4.0 and ～3.2 Ma, and their biomass fraction was up to 50%; and （ ⅲ ） the biomass of C4 vegetation since ～2.0 Ma seems to have been decreased to the level （about 20%） before 4.0 Ma. C4 plant expansion at Lingtai cannot be fully understood with the 'global C4 expansion' model because it occurred much later up to 3.0 Ma than in Pakistan, which indicates that some changes in the regional climatic system may also contribute to C3/C4 shift except changes in atmospheric CO2 concentrations and temperature. The latitudinal zone for C3/C4 transition seems to move southwards slightly in East Asia, compared with the case in North America where 37°N is the ideal

关键词： pedogenic carbonate palaeovegetation shift atmospheric CO2 concentrations.

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Multifunctional AlPO_(4)reconstructed LiMn_(2)O_(4)surface for electrochemical lithium extraction from brine

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Journal of Energy Chemistry 2024年第2期89卷 410-421,I0010页

作者： Jun gu Linlin Chen Xiaowei Li guiling Luo Linjing Fan Yanhong Chao Haiyan Ji Wenshuai Zhu School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina College of Science State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum-BeijingBeijing 102249China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

LiMn_(2)O_(4)(LMO)electrochemical lithium-ion pump has gained widespread attention due to its green,high efficiency,and low energy consumption in selectively extracting lithium from ***,collapse of crystal structure and loss of lithium extraction capacity caused by Mn dissolution loss limits its industrialized ***,a multifunctional coating was developed by depositing amorphous AlPO_(4)on the surface of LMO using sol-gel *** characterization and electrochemical performance test provided insights into the mechanism of Li^(+)embedment and de-embedment and revealed that multifunctional AlPO_(4)can reconstruct the physical and chemical state of LMO surface to improve the interface hydrophilicity,promote the transport of Li^(+),strengthen cycle ***,after 20 cycles,the capacity retention rate of 0.5AP-LMO reached 93.6%with only 0.147%Mn dissolution *** average Li^(+)release capacity of 0.5AP-LMO//Ag system in simulated brine is 28.77 mg/(g h),which is 90.4%higher than ***,even in the more complex Zabuye real brine,0.5AP-LMO//Ag can still maintain excellent lithium extraction *** results indicate that the 0.5AP-LMO//Ag lithium-ion pump shows promising potential as a Li^(+)selective extraction system.

关键词： LiMn_(2)O_(4) Multifunctional AlPO_(4)coating Li^(+)embedment and de-embedment mechanism Stability Hydrophilicity Various solution

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Lightweight,Flexible Cellulose-Derived Carbon Aerogel@Reduced Graphene Oxide/PDMS Composites with Outstanding EMI Shielding Performances and Excellent Thermal Conductivities

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Nano-Micro Letters 2021年第6期13卷 126-142页

作者： Ping Song Bei Liu Chaobo Liang Kunpeng Ruan Hua Qiu Zhonglei Ma Yongqiang guo Junwei gu MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072P.R.China Xi’an ESWIN Silicon Wafer Technology Co.Ltd Xi’an 710100P.R.China

In order to ensure the operational reliability and infor-mation security of sophisticated electronic components and to protect human health,efficient electromagnetic interference(EMI)shielding materials are required to attenuate electromagnetic wave *** this work,the cellulose solution is obtained by dissolving cotton through hydrogen bond driving self-assembly using sodium hydroxide(NaOH)/urea solution,and cellulose aerogels(CA)are prepared by gelation and ***,the cellulose carbon aerogel@reduced graphene oxide aerogels(CCA@rGO)are prepared by vacuum impregnation,freeze-drying followed by thermal annealing,and finally,the CCA@rGO/polydimethylsiloxane(PDMS)EMI shielding composites are prepared by backfilling with *** to skin-core structure of CCA@rGO,the complete three-dimensional(3D)double-layer con-ductive network can be successfully *** the loading of CCA@rGO is 3.05 wt%,CCA@rGO/PDMS EMI shielding composites have an excellent EMI shielding effectiveness(EMI SE)of 51 dB,which is 3.9 times higher than that of the co-blended CCA/rGO/PDMS EMI shielding composites(13 dB)with the same loading of *** this time,the CCA@rGO/PDMS EMI shielding composites have excellent thermal stability(T_(HRI) of 178.3℃)and good thermal conductivity coefficient(λ of 0.65 W m^(-1) K^(-1)).Excellent comprehensive performance makes CCA@rGO/PDMS EMI shielding composites great prospect for applications in lightweight,flexible EMI shielding composites.

关键词： Polydimethylsiloxane Electromagnetic interference shielding Cellulose carbon aerogel Reduced graphene oxide

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Helium extraction from natural gas using DD3R zeolite membranes

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Chinese Journal of Chemical Engineering 2022年第9期35卷 122-129页

作者： Ping Zhang Chao Gong Tao Zhou Peng Du Jieyu Song Mengyang Shi Xuerui Wang Xuehong gu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 211816China

Helium(He)is commercially produced from natural gas by low-temperature *** process is energy extensive because of the extremely low He concentration(<0.3%)and the operation at cryogenic *** we demonstrated DD3R zeolite membrane was efficient to extract He from natural gas at atmosphere *** membrane performance was evaluated in terms of temperature,pressure and molar *** overall membrane performance was dominated by the diffusivity *** single He permeance and ideal He/CH_(4) selectivity were 5.8×10^(-9)mol·m^(-2)·s^(-1)·Pa^(-1)and 79 under a feed pressure of 1.3 *** though He concentration was as low as 0.22%,the He permeance and He/CH_(4) mixture selectivity were 3.0×10^(-9)mol·m^(-2)·s^(-1)·Pa^(-1)and 44 at 0.7 *** the longterm operation(~130 h)the membrane performance was stable even the feed mixture containing3.6%ethane as *** results approved the feasibility of DD3R zeolite membranes for He extraction from natural gas.

关键词： He extraction Zeolite Membranes He/CH_(4)separation Natural gas

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三角形子通道超临界水热工水力特性数值分析

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核动力工程 2008年第4期29卷 50-56页

作者：顾汉洋杨燕华程旭上海交通大学核科学与工程学院上海200240

目前国际上对超临界水冷堆进行了大量的研究,但对其堆芯内超临界流体流动传热的认识还十分有限。本文采用CFX对超临界水冷堆典型三角形子通道内的流动传热特征进行了CFD研究,对比分析了包壳壁面等热流密度和燃料芯块等体积热流密度两种... 详细信息

目前国际上对超临界水冷堆进行了大量的研究,但对其堆芯内超临界流体流动传热的认识还十分有限。本文采用CFX对超临界水冷堆典型三角形子通道内的流动传热特征进行了CFD研究,对比分析了包壳壁面等热流密度和燃料芯块等体积热流密度两种情况。计算结果表明,不锈钢包壳层的周向导热显著强化了燃料棒圆周上温度分布和传热系数的均匀性,但对二次流和湍流脉动的影响不大。间隙区的湍流脉动主要受几何参数P/D的影响,当P/D1.3时,湍流交混系数较小,在温度拟临界点附近区域,存在交混系数的突变。

关键词：超临界水冷堆三角形子通道流动传热 CFD 包壳层燃料芯块

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Multi-ion intercalated Ti_(3)C_(2)T_(x)MXene and the mutual modulation within interlayer

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Particuology 2023年第1期72卷 10-16页

作者： Zhihe Wang Yixuan Wang Qinhua gu Cuimei Zhao Junkai Zhang Shichong Xu Ming Lu Bingsen Zhang Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education the Joint Laboratory of MXene MaterialsKey Laboratory of Preparation and Application of Environmental Friendly Materials of the Ministry of EducationJilin Normal UniversityChangchun 130103China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Intercalation of ions between the adjacent MXene layers can change the interlayer environment and influence the electrochemical ion storage *** order to understand the effect of multi-ions confined by the MXene layers on the performance of electrochemical energy storage,Co^(2+),Mn^(2+)and Ni^(2+)intercalated into Ti_(3)C_(2)T_(x)MXene which already pre-intercalated Al3+are obtained by spontaneous static *** on the monitor of(002)crystal orientation,intercalated multi-ions can regulate and control the interlayer environment of MXenes via stress,which induces lattice shrinkage occurring in the c *** by ion storage mechanism-performance,the multi-ion occupies the interspace of MXene and affects the electrochemical *** work would offer guidance to understand the relationship among the multi-ion and MXene by two-dimensional(2D)layered materials.

关键词： MXene lon pre-intercalation Interlayer Transition metal ion

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PtCu subnanoclusters epitaxial on octahedral PtCu/Pt skin matrix as ultrahigh stable cathode electrocatalysts for room-temperature hydrogen fuel cells

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Nano Research 2023年第2期16卷 2252-2258页

作者： Fengling Zhao Lirong Zheng Qiang yuan Qinghua Zhang Tian Sheng Xiaotong Yang Lin gu Xun Wang State-Local Joint Laboratory for Comprehensive Utilization of Biomass Center for R&D of Fine ChemicalsCollege of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Lab of Organic Optoelectronics&Molecular Engineering Tsinghua UniversityBeijing 100084China College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241000China Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics Beijing 100190China

Achieving stable surface structures of metal catalysts is an extreme challenge for obtaining long-term durability and meeting industrial application *** report a new class of metal catalyst,Pt-rich PtCu heteroatom subnanoclusters epitaxially grown on an octahedral PtCu alloy/Pt skin matrix(PtCu1.60),for the oxygen reduction reaction(ORR)in an acid *** PtCu1.60/C exhibits an 8.9-fold enhanced mass activity(1.42 A·mgPt^(−1))over that of commercial Pt/C(0.16 A·mgPt^(−1)).The PtCu1.60/C exhibits 140,000 cycles durability without activity decline and surface PtCu cluster stability owing to unique structure derived from the matrix and epitaxial growth pattern,which effectively prevents the agglomeration of clusters and loss of near-surface active *** characterization and theoretical calculations confirm that Pt-rich PtCu clusters favor ORR activity and thermodynamic *** room-temperature polymer electrolyte membrane fuel cells,the PtCu1.60/C shows enhanced performance and delivers a power density of 154.1/318.8 mW·cm^(−2)and 100 h/50 h durability without current density decay in an air/O_(2)feedstock.

关键词： epitaxial growth core–shell nanostructure PtCu alloy oxygen reduction reaction hydrogen fuel cells

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Fluorine-Modulated MXene-Derived Catalysts for Multiphase Sulfur Conversion in Lithium-Sulfur Battery

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Nano-Micro Letters 2024年第12期16卷 201-216页

作者： Qinhua gu Yiqi Cao Junnan Chen yujie Qi Zhaofeng Zhai Ming Lu Nan Huang Bingsen Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016People’s Republic of China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016People’s Republic of China The Joint Laboratory of MXene Materials Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of EducationKey Laboratory of Preparation and Application of Environmental Friendly Materials of the Ministry of EducationJilin Normal UniversityChangchun 130103People’s Republic of China

Fluorine owing to its inherently high electronegativity exhibits charge delocalization and ion dissociation capabilities;as a result,there has been an influx of research studies focused on the utilization of fluorides to optimize solid electrolyte interfaces and provide dynamic protection of electrodes to regulate the reaction and function performance of ***,the shuttle effect and the sluggish redox reaction kinetics emphasize the potential bottlenecks of lithium-sulfur *** fluorine modulation regulate the reaction process of Li-S chemistry?Here,the TiOF/Ti_(3)C_(2)MXene nanoribbons with a tailored F distribution were constructed via an NH4F fluorinated *** on in situ characterizations and electrochemical analysis,the F activates the catalysis function of Ti metal atoms in the consecutive redox *** positive charge of Ti metal sites is increased due to the formation of O-Ti-F bonds based on the Lewis acid-base mechanism,which contributes to the adsorption of polysulfides,provides more nucleation sites and promotes the cleavage of S-S *** facilitates the deposition of Li_(2)S at lower ***,fluorine has the capacity to capture electrons originating from Li_(2)S dissolution due to charge compensation *** fluorine modulation strategy holds the promise of guiding the construction of fluorine-based catalysts and facilitating the seamless integration of multiple consecutive heterogeneous catalytic processes.

关键词： Catalysis Fluorination MXene Lithium-sulfur battery Shuttle effect

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